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This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates.

$5 - $10 per student Ages 14 - adult 1 to 4 weeks
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In this activity, learners use crayons to draw conclusions about rocks and the rock cycle.

$5 - $10 per group Ages 8 - 18 45 to 60 minutes